13 Aug
2004
13 Aug
'04
9:23 p.m.
Dave Dunfield said:
Checking the Schematic, bit 1 of the low memory bank
is U17 - pulled it,
put in a
socket (always!) and stuffed another 4116 - voila!!! it came right up!
Ah... 4116es! How much money did I make at school, fixing ZX Spectrums
that had weird black-and-white stripey stuff on the screen..? Almost
always, you'd find that one of the eight 4116es had failed, and was
(coincidentally) pulling the +12V line from the dinky little chopper PSU
down, which also fed the chroma modulator... Hence the black and white
screen.
Gordon.